I have a 1998 Nissan Frontier. It will not start. I have check fuses and starter and battery. Have power but won't start. Cannot locate the Starter Relay Switch. Where exactly is it located?

You may have a failing starter. After about 5 - 7 years the battery begins to weaken it will allow your starter to kick but the starter itself may be too worn and too weak to keep your flywheel turning.

Check your battery connections. Disconnect them and clean the posts. If this does nothing then check both your positive and ground wires going to the starter. You are not getting juice for one reason or the other.

When you jumped the car did the engine spin over any faster or did it stay The same??? If it spun faster then the next step is to see if it is getting fire to the cylinders

BAD GROUND WIRE, OR YOU MISSED SOMETHING....FUSEABLE LINK?????? BAD POSITIVE CABLE, BAD NEG CABLE..... MASTER FUSE?????

Know this problem was posted several years ago, but having same issue with my 2008 Nissan Rogue. We've tried everything short of having the battery replaced, (including charging it), and nada. So, tomorrow morning, that'll be our next move. Sucks, but best thing to die. Much rather than than an alternator, starter or solenoid.

maybe starter relay?

The starter on the Nissan Frontier is a motor that is connected to the battery that runs the ignition process of the truck. When you turn the key to start the truck, this will send an electrical signal to the starter motor that turns the flywheel. The flywheel in turns moves the crankshaft. When the starter goes bad or teeth on the starter gear get chipped this will prevent the truck from starting. Locating the starter is the first step in replacing it.

• Open the hood to access the engine compartment. Locate the battery to the passenger side of the engine compartment.
• Identify the positive terminal of the battery. This will be indicated by the (+) symbol above the terminal.
  
• Trace the red cable that is attached to the positive terminal. The cable will run from the battery down to the side of the motor.
• Locate the end of the red cable as it is attached to the starter. The starter will be attached to a bracket by the motor with the back of the starter connected to the bell housing of the transmission.
• Remove the front passenger side tire for easier access to the starter. This will also give you plenty of room to remove the starter.
  

I hope this helps.

Good luck.

Your starter solenoid is probably bad if the battery is good. Not sure if you can get just the solenoid or you have to buy the whole starte. Also check to make sure the cables are tight not only on the battery but the starter as well

Make sure you have 12 volts from the positive side of the battery to the starter. Check the small wire on the starter solenoid and make sure you have 12 volts when cranking engine. If voltage is correct, the starter is bad

sometimes its the simple things. On the foot pedal for the clutch are rubber grommets that push the switch in on the manual trans. they get old and fall off or develop holes in them so the switch does not get depressed.